Leather shaving apparatus



Dec. 5, 1961 L. R. WILSON 3,011,329

LEATHER SHAVING APPARATUS Filed May 4, 1959 2 Sheets-Sheet 1 LAWRENCE Rmcurrflw l'iow Attorneys Dec. 5, 1961 1.. R. WILSON 3,011,329

LEATHER SHAVING APPARATUS Filed May 4, 1959 2 Sheets-Sheet 2 lnuntor LAWRENCE RATCLIHT WILSON iii M A ltorneyS United States Patent 3,011,329 LEATHER SHAVIN G APPARATUS Lawrence R. Wilson, Liverpool, England, assignor to Edward Wilson & Son Limited, Liverpool, England,

a British company Filed May 4, 1959, Ser. No. 810,644 Claims priority, application Great Britain May 7, 1958 1 Claim. (Cl. 6937) This invention relates to the-so calledshaving of leather, and has for its object to provide apparatus therefor, which, while suitable for treating leather of varying grades, is particularly applicable to the treatment of fine quality leathers, for example, suede and chrome calf leathers.

The cutting means of conventional leather shaving apparatus usually comprises a roller or cylinder adapted to be rotated at high speed and around the periphery whereof are secured two sets or series-one right hand and the other left hand-of helically curved blades spaced from each other at constant pitch, and the ends of one set of blades meeting the ends of the oppositely curved set of blades in overlapping abutment at a position midway between the cylinder ends. Such a cutting arrangement possesses a disadvantage in that it causes the portion of the leather which has been in proximity with, or in the path of, the overlapping blade ends to be left with a disfigurement which, whilst perhaps unimportant in coarse grade leather, shows up to a varying extent in, and so is detrimental to, the finer types of leather before referred to.

The present invention aims to obviate this defect, and tothis end the abutting or adjacent ends of the oppositely curved blades are arranged relative to the peripheral transverse center line of the cylinder in such manner that, as far as practicable, there is no overlapping of the operative cutting edges of the complementary pairs of right and left hand blades.

3,011,329 Patented Dec. 5, 1961 and g an oppositely curved series of eight blades. The arrangement of said blades is such that blade f terminates short of the transverse center line of the roller, the end of its operative cutting edge extending to the line designated h-h, while the complementary blade g to the opposite hand extends across the center line so that its operative cutting edge also terminates on line hh. Blade f extends nearer to the center lineterminating on line jjand complementary blade 3 extends across the center line up to said line 'j. The operative edges of blades F, g terminate on the center line. It will be seen that thus far none of the cutting edges of the complementary left and right handed blades overlap, and that their terminal ends progressively approach the center line. Blades g, g and g together with complementary blades f f and f are similarly arranged with their operative cutting edges terminating respectively on lines k-lc, c1-c1, and J-l- For practical reasons blades 7' and g abut one another as shown, and the operative cutting edges of blades g, f terminate on line k-k.

With the blades so arranged, the portion of the rollers periphery which contains the inner ends of the two series of helical blades g (i.-e. that area bonded by lines hh The invention is further described with the aid of the slots a formed to one hand and helical grooves b formed to the other hand. Within grooves a are located in known manner a series of blades 0, and in grooves b are a similar series of blades d. The intended direction of rotation is indicated by the arrow. It will be seen that the inner end of each blade 0 and each blade d crosses the transverse center line of the roller and their operative cutting edges overlap for a distance e measured axially of the roller. In the use of a roller having this known blade arrangement, that part of a piece of leather coming into contact with the roller surface containing said overlapping blade ends will be abraded by twice as many cutting edges as the remainder of the leather and, in consequence, becomes visibly marked or disfigured.

Referring now to FIG. 2, which shows a blade arrangement according to the present invention, 1'' generally denotes one series of eight (in this instance) helical blades and mm) has substantially the same operative cutting or shaving potential as the rest of the roller, and experi ment has shown that, in the use of such an arrangement, the marking of leather is obviated or is of such transient nature as to disappear in the subsequent treating of the leather.

It will of course be appreciated that the number and pitch of the helical blades embodied in a roller may be varied as required and will govern the actual disposition of the complementary blades ends and the extent of the area within which the adjacent ends of the blades are arranged.

A blading arrangement according to the invention may with advantage be used on so-called setting rollers or cylinders.

What I claim as my invention and desire to secure by Letters Patent is:

A shaving roller for use in the treatment of leather, comprising two series of helically curved blades with one series being right hand curved blades and the other series being left hand curved blades, a roller having right and left hand helical grooves with each of said right hand blades being set in a different one of said right hand grooves and each of said left hand blades being set in a different one of said left hand grooves, the majority of said blades having each complementary pair of right and left hand blades thereof positioned with the adjacent ends of their operative cutting edges terminating without overlap at points which are uniformly spaced, in an axial direction of said roller, within an area extending on each side of the peripheral transverse center line of said roller and the remainder of said blades having each right hand blade thereof positioned with the endof its cutting edge terminating without overlap on a transverse peripheral line common to the end of the cutting edge of a single left hand blade of said remainder of said blades.

References Cited in the file of this patent UNITED STATES PATENTS 

